Improvement in steam-cylinder heads for compound engines



I -1,4F. no'LLuwAY. i Steamylin'der Heads for-ompoud Engines.

No. l58,378. l' -Paf-ntedr1an.5,1a15.

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UNITED STATES PATENT EEIGE.

JOSEPHUS F. HOLLOWAY, OF CLEVELAND, OHIO.

IMPROVEMENT IN STEAM-CYLINDER HEADS FOR COMPOUND ENGINES.

Specification forming part of Letters Patent No. 158,378, dated January 5,1875; application tiled August 10, 1874. C

To all whom it may concern:

Be it known that I, J osEPEUs F. HOLLO- WAY, of Cleveland, in the county of Cuyahoga and State of Ohio, have invented a new and useful Improvement in the Construction of the Intermediate Steam-Cylinder Head of Combined or Compound Steam-Engines, of which the following is a description:

My invention is intended as an improvement upon the manner of constructing that class of steam-engines known as combined or compound engines, in which the cylinders are placed end to end, either one above the other, as in vertical engines, or one behind the other, as in horizontal engines, and in which the steam, after having been used at high pressure in the smaller cylinder, is exhausted into the larger cylinder.

The nature ot' my invention consists in the combination of the intermediate head, constructed as hereinafter described, and one or more removable side sections, which complete the head of the lower cylinder a-nd permit access therein.

Figure l is a vertical transverse section, showing a portion of the upper or small cylinder, and a portion ot' the lower or large cylinder, with the intermediate head between them. Fig. 2 is a vertical elevation, one-half in transverse section, showing the large and small cylinders, with the intermediate head between them, and showing also the exhaustpassages within the -intermediate head. Fig. 3 is a sectional view of the large cylinder, showing the port through which the exhaust steam from the small cylinder enters the steamchest of the large cylinder. Fig. 4 is a top view ot' the intermediate head, showing the ports through which the exhaust steam from the small cylinder enters the intermediate head, and also the manner of constructing that part of the intermediate head resting on the large cylinder, and which serves as a cover for same.

Similar letters refer to similar parts in all the drawings.

A is the small or high-pressure cylinder. B is the large or low-pressure cylinder. C is the intermediate head between the cylinders. D is the passage cast in the intermediate head to convey the exhaust steam from the small to the large cylinder. E is a portion of the intermediate head, made separate from the central part, but iitted and bolted to it so as to form the head of the large cylinder, while at the same time they can be removed at any time when it is necessary to examine into or enter the large cylinder. F is the piston-head of the small cylinder. Cr is the piston-head of the large cylinder.

The passage or passages D D, that extend throughout the y entire length of the intermediate head, may be made to consist of one Y single passage, or of two separate passages, or of two passages terminating in one, the number, size, and location of the same depending entirely as to how the corresponding ports or passages are cast in the small and large cylinders, it only being necessary that they correspond with these passages. I make the end of the intermediate head, that serves as a cover for the large cylinder, in two or more parts. The central part, C, containing the stuEting-boxes for the piston-rod, being central and stationary, and held by bolts to both small and large cylinders, on one or both sides I make the separate pieces E E, which are fitted to the sides of the central part, C, and held in place by bolts. They are also titted to the top ot' the large cylinder, and when bolted thereto they form a portion ot' the headfor said cylinder. The object of this arrangement ot the parts E E in connection with the central part, C, is, that by removing one or more sections of the head E E it will be possible to enter the large cylinder i'or the purpose of setting out the packing or to examine the same Without disturbing the central part, C, or breaking any of the joints by which it is connected to the small or large cylinders, or in any way disturbing the alignment of one cylinder with the other.

I am aware of the horizontal compound engine patented by Cooper and Emery. This en gine has a peculiar arrangement of ports and steam andl exhaust passages. The live steam from the boiler, aswell as the steam after it has been used once in the small cylinder, as well as the exhaust steam of the large cylinder, is admitted, controlled, and exhausted into and from both cylinders by and through a single steam-chest of an essential construction in connection with a single slidevalve adapted to this peculiar arrangement of single steam-chest, (and its combined steam and exhaust passages,) whereby two pistons in two separate and distinct steam-cylinders are operated to drive one common piston-rod and its attachments. My engine differs from the Cooper and Emery engine in having each cylinder provided with its own valve, and its own distinct steam and exhaust ports and passages, so that each engine can be worked alone and without the other in case one is disabled; and :in connection with this feature of construction there is an exhaust-passage cast within the head, between the two chests. This passage does not carry any live steam from a single steam-chest, nor convey live steam in any way, but is simply an exhaust-pipe cast within the head.

What I claim as my invention, and desire to secure by Letters Patent, is-

The head C for a compound engine, constructed in form of a tubular pedestal, and having stufng-boxes within :it at top and bottom, exhaust and steam passages cast within one of its walls, and base bolting-extensions on two of its sides, in combination with one or more removable side sections, which complete the head of the lower cylinder, E, and permit access therein, substantially in the manner and for the purpose herein described.

W. H. THOMPSON, J oHN Rice. 

